Solar / Photovoltaic from an economic perspective

  • Erstellt am 2015-10-13 18:36:51

f-pNo

2015-10-15 00:47:17
  • #1


You are of course right. However, I simply don’t have my documents with me at work and also don’t have the time for extensive calculations.

So now (during “Walking Dead”) I have some time for this. However, only a “rough calculation,” since I don’t feel like doing a large Excel calculation.
Acquisition 9,500 euros minus reimbursed VAT 1,526 euros = approx. 8,000 euros
8,000 euro loan at 1.5% interest rate = 120 euros p.a. x 20 years = 2,400 euros
8,000 + 2,400 = 10,400 euros financing cost

Payment from the electricity provider 50 euros p.m. = 600 euros p.a. (there is likely still a small buffer at year-end)
600 euros x 20 years = 12,000 euros revenue in 20 years

This does not yet take into account that about 20-25% of the production is used for own consumption (here you can simply assume every kWh at least 0.20 euros) = saved electricity costs.
Also, it is not considered that the interest expense decreases with every monthly repayment.
However, potential maintenance costs were also not taken into account (since I currently have no idea what amount these might be).

To round this off from the tax side:
You have to pay VAT to the tax office on the remuneration for the electricity revenue. Also on the own consumption. You can then mostly reclaim this via the tax return (depreciation of the system, the interest, etc.).

I hope this helps you a little.

PS: I record the data on electricity consumption, production, feed-in, etc. daily in Excel. That’s why I also have a relatively good overview regarding our system.
 

Ecart

2015-10-19 07:54:22
  • #2


Can you post values (screenshot) from your photovoltaic system?

For me, it is also 10 years, photovoltaics are from 07/2011.

Photovoltaic system (8.225 kWp).
Feed-in: € 0.2874
Self-consumption: € 0.1236

Value 2012: (period = 07/2011 to 2012)

Value 2015: As of today (19.10.2015)


Of course, a photovoltaic system with battery storage will be installed on the new house again. At the end of 2015, the Tesla Powerwall will be delivered...
 

f-pNo

2015-10-19 17:30:49
  • #3
I asked this question some time ago - maybe you know more about it: Battery storage for photovoltaic electricity is subsidized as far as I know. Do you have any information on whether the (comparatively relatively affordable) Tesla Powerwall will also qualify for the subsidy?
 

Ecart

2015-10-19 18:35:32
  • #4
Have a look at this here at KFW:

275
Loan
Renewable Energy – Storage
Generate and store electricity from solar energy

With the funding product Renewable Energy – Storage, we promote the new installation of stationary battery storage systems in combination with photovoltaic systems.

Your funding consists of 2 parts:

a low-interest loan from KfW
a repayment grant from funds of the Federal Ministry for Economic Affairs and Energy (BMWi).

Also for the storage retrofit of photovoltaic systems that were put into operation after 31.12.2012.

BG
Ecart
 

f-pNo

2015-10-19 22:03:45
  • #5

Thank you very much. I was already familiar with the KfW program with repayment grant.

However, I am not sure whether Tesla batteries are also subsidized here. On the one hand, because the battery is still completely new (often product lists are stored for the subsidy). On the other hand, because the batteries are probably becoming quite affordable (I once read about approx. 3,000 euros for 10kWh).
 

nordanney

2015-10-19 22:22:22
  • #6

The battery is then not quite that cheap. The price quoted by Tesla is, as far as I know, the wholesale price. So a dealer markup is still added. Additionally, an inverter for about €1,500 must be purchased and the installation will also cost.
I would still like to have a Powerwall
 

Similar topics
03.09.2019Photovoltaic system: Advantages and disadvantages, experiences, worthwhile?133
08.12.2014Small photovoltaic system 2 KWp11
07.12.2015Heating question new building KFW 70 air heat pump + solar, ice storage?29
05.06.2015Photovoltaic system for hot water preparation and feed-in15
22.12.2015KFW 70 funding still in 201524
18.09.2016Operate heat pump autonomously with photovoltaic system.88
13.07.2016Photovoltaic storage - experiences? Tips?17
10.10.2017New photovoltaic system with storage in single-family home - experiences39
01.05.2021KfW loan + repayment grant for granny flat39
10.12.2017Second residential unit in the house due to KfW funding 15313
16.04.2020Is the KfW loan still salvageable / changeable?10
14.02.2024Bafa funding for heat pumps will be discontinued as of 31.12.2020.508
18.11.2021KfW funding for KfW 40 Plus houses from now and from 01.07.202157
06.07.2021KfW loan is expected to become cheaper from 01.07.58
31.08.2021Kfw 40 Plus funding - Ban on feed-in tariff?21
14.06.2022KfW BEG funding stopped 261, 262, 263, 264, 461, 463, 4641239
07.03.2024New funding for family home ownership201
25.12.2024Can Tesla batteries be used as home storage?13
11.01.2025KfW 300 funding upon disposal of real estate ownership10

Oben